Method and system for estimation of mobile station velocity in a cellular system based on geographical data

Abstract

A system and method for estimating velocity of a mobile station in a wireless communication system using time-frequency signal processing and a geographical database. The geographical database is used for prediction of ray trajectory and ray power to provide an estimate of propagation delay associated with database points.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part application of U.S. patent application Ser. No. 12 / 848,572, filed Aug. 2, 2010, now U.S. Pat. No. 8,131,312 which in turn is a continuation-in-part application of U.S. patent application Ser. No. 12 / 786,173, filed May 24, 2010, now U.S. Pat. No. 8,200,244 both of which are incorporated in their entirety herein by reference.FIELD OF THE INVENTION[0002]The present invention relates generally to environmental modeling, and in particular to calibration of an environmental model using wireless signals.BACKGROUND OF THE INVENTION[0003]Accurate location of mobile terminals, e.g. mobile telephones, in a wireless system, for example, a cellular telephone communication system, has been a difficult challenge. Several techniques have been proposed and partially developed to address this problem, but there remains a need for a technique with greater precision of location. It is generally desirable that such a...

AI Technical Summary

Problems solved by technology

Accurate location of mobile terminals, e.g. mobile telephones, in a wireless system, for example, a cellular telephone communication system, has been a difficult challenge.

Prediction of received signal strength of signals from mobile terminals that may be operating in actual environments may be a difficult task.

A source of difficulty may be a lack of available information about a propagation environment, at least in a precision that may be required for an accurate application of a theory of wave propagation, e.g. electromagnetic wave theories presented by James Clerk Maxwell.

This lack of information may be inherent in a modeling problem as a propagation environment may be changing dynamically, and also may be random in nature.

Images